What size is your exhaust?
Mine is 2.5" so I got the 2.5 inch cat, 2.5 inch flex.....you get it right?
As for the SVT cat, get the Random Tech Cat from McNews here:
Made for the SVT header on a Zetec ZX3 like what you have.
You can get your flex through trubendz here:
As for power I have no idea. My guess would be 10-15 hp????